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Synthetic Lubricants Derived from Plastic Waste and their Tribological Performance
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Researchers converted pre- and post-consumer polyolefin plastic waste into high-quality synthetic lubricants, demonstrating tribological performance comparable to premium polyalphaolefin base oils and a 44% reduction in wear compared to petroleum-based Group III mineral oil. Life cycle and economic analyses confirmed the process is both energetically efficient and commercially viable, offering a novel pathway for plastic waste upcycling.
The energy efficiency, mechanical durability, and environmental compatibility of all moving machine components rely heavily on advanced lubricants for smooth and safe operation. Herein an alternative family of high-quality liquid (HQL) lubricants was derived by the catalytic conversion of pre- and post-consumer polyolefin waste. The plastic-derived lubricants performed comparably to synthetic base oils such as polyalphaolefins (PAOs), both with a wear scar volume (WSV) of 7.5×10-5 mm-3 . HQLs also performed superior to petroleum-based lubricants such as Group III mineral oil with a WSV of 1.7×10-4 mm-3 , showcasing a 44 % reduction in wear. Furthermore, a synergistic reduction in friction and wear was observed when combining the upcycled plastic lubricant with synthetic oils. Life cycle and techno-economic analyses also showed this process to be energetically efficient and economically feasible. This novel technology offers a cost-effective opportunity to reduce the harmful environmental impact of plastic waste on our planet and to save energy through reduction of friction and wear-related degradations in transportation applications akin to synthetic oils.
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This study evaluates the friction, wear, and lubrication performance of synthetic grease produced from recycled waste plastics, assessing whether it can meet the tribological demands of mechanical applications. The research supports circular economy goals by exploring a value-added use case for plastic waste that would otherwise require complex recycling or disposal.
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Scientists tested nine biodegradable plastics to see if they could replace conventional plastics in mechanical parts like bearings and seals, everyday components found in appliances, vehicles, and machinery. Five of the plastics performed about as well as standard plastics in terms of durability and friction, suggesting they could help reduce plastic waste and microplastic pollution without sacrificing performance. This matters because swapping in biodegradable materials for hard-to-recycle plastic parts could shrink the mountain of plastic waste (and the microplastics it sheds) that eventually ends up in our environment, food, and bodies.
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